"informer," 1785, probably from underworld slang meaning "the nose" (1700), which apparently developed from an earlier meaning "fillip on the nose" (1670s). Snitcher in same sense is from 1827. snitch (v.) 1803, "to inform," from snitch (n.).

Where did snitching come from?

The oldest meaning of the informal snitch is "to betray" or, as a noun, "informer." This probably stems from 18th-century underworld slang, in which snitch meant "nose" — perhaps because a snitch is really nosy.

When was Stop Snitching made?

"Stop Snitchin" is a song by American rapper YG, released as the lead single for his fourth studio album 4Real 4Real on April 24, 2019. It is a diss track aimed at rapper 6ix9ine.